Heating and ventilating system



July 13, 1937, R. J. PARSONS 2,087,214

HEATING AND VENTILATING SYSTEM Filed Feb. 15, 1936 \70 PROPULS ON MOTORC ON 71? OZ.

lNV NTOR ATTORNEY Patented July 13, 1937 2,087,214 HEATING ANDVENTILATING SYSTEM Robert J. Parsons, Schenectady, N. Y., assignor toConsolidated Car-Heating Company, Inc., Albany, N. Y., a corporation ofNew York Application February 15, 1936, Serial No. 64,057

4 Claims.

This invention relates to new and useful apparatus for heating andventilating and has especial reference to heating and ventilatingenclosures such as rooms, trolley cars, and the like, where the heatingand ventilating is achieved by means of a fan blower and heatingresistances associated therewith and is related to my copendingapplication Serial Number 84,878, filed June 12, 1936.

The main object of this invention is to provide a simple and efllcientmechanism wherein the heating resistances are not put into circuit untilthe fan blower is in motion and has reached a predetermined speed.

A further object is to provide mechanism whereby when the fan blowerreaches a predetermined speed of rotation some of the heatingresistances and the main power circuit will be closed and made effectivebut another resistance will remain ineffective until the heat in theenclosure to be heated has reached a predetermined minimum.

Further and more specific objects, features and advantages will moreclearly appear when the specification hereinafter is considered and istaken in connection with the accompanying drawing which form part of thespecification and will illustrate a present preferred form which theinvention may assume.

Generally and briefly considered in its broader aspects, the inventioninvolves a fan blower disposed in association with a plurality ofheating resistances and adjacent an enclosure to beheated andventilated. The enclosure is provided with a thermostat which is also incircuit with a relay, controlling at least one of said resistances. Thefan blower is associated also with a speed governor of the centrifugaltype preferably which when in motion operates and closes a series ofswitches whereby the main power circuit and the resistance circuits aregoverned and these circuits are made effective. Certain of theresistances are also governed by the thermostat so that when thegovernor closes the circuit of some of the resistance another portion ofthe resistance is not closed until and unless the heat in the enclosureto be heated has reached a predetermined minimum. v

The invention as illustrated in the drawing Uy the single figure is aschematic diagram of the elements employed and their circuitconnections.

The invention as illustrated in the drawing comprises an enclosure to beheated numbered ll having a floor H beneath which is disposed a motor 12connected by wire l3 to a source of power which may be the trolley of atrolley car. Beneath the floor II is a wall l4 forming with the floor aduct within which the motor l2 and the associated apparatus is disposed.At the 5 left end of the duct is a damper plate l5 which in the neutralposition shown permits air to enter the duct both from the admissionport It and from the overlying enclosure itself. When in its lowerposition the damper plate [5 will permit-air into the duct from theenclosure only and when in its upper position it will permit air toenter the duct only from below or outside the car. The motor l2 operatesa shaft IS on which is mounted a generator 20 having a shaft 2| carryinga fan blower 22. The field ,coil 23 of the motor is connected by wire 24to the negative side of the power line. In the duct near the fan bloweris a resistance 25 which may be the resistance of the ordinary trolleycar associated with its controller or may be an ordinary heatingresistance and is connected in circuit in any suitable manner. A regularheating resistance 26 is also in the duct and is connected by wire 21with the negative side of the power line.

The field coil 29 of the generator 20 is shunted across its terminals.The generator 20 is con- 'nected on one side by wire 30 to one side of acircuit containing a battery or other device. The other side of thegenerator 20 is connected by 30 wire 33 to the other side of the samecircuit. A rearward extension 34 of the motor shaft I9 is provided witha centrifugal device 35 of any desired type connected so as to movelongitudinally the stub shaft 31 on which are supported bridg- 35 ingcontacts 38 and 39 adapted respectively to connect wires Ill-4| and4546. Wire 40 leads to a thermostat 42 having bridging contact 43connecting, when closed, wire 40 with a, wire 44 leading to the negativeside of the trolley or 40 power line. Wire 4| leads to a relay coil 41and resistance 48 connected by wire 52 to the power line. The relay 41actuates a switch element 50 which when closed connects wire 52 with awire 5| leading to the negative side of the power line.

Wires l5 and 46 when closed by the bridge 39 govern, in any desired way,the controller for the propulsion motor, as that motor may not beoperated unless bridge 39 connects wires 45 and 46.

In the operation of the device, when the trolley is placed on the powerwire the motor l2 through wire l3 receives power and starts to rotatethus rotating shafts I9, 34, and 2| and thus rotates the governor 35 thegenerator 20 and the fan 55 bridges 38 and 39 and thus closes the abovenamed circuits. When this happens, at once the resistance 25 is placedin circuit and some heating takes place and the other power devices inthe circuit of wires 45 and 46 can function for whatever purpose thatmay be desired. However the resistance 26 is not placed operatively incircuit until and unless the bridge 43 of the thermostat 42 is closedand this is closed only when the heat in the enclosure to be heated hasreached a predetermined minimum. When the minimum heat is reachedhowever the bridge 43 is closed and this energizes the coil 41 liftingthe switch element 50 and closing the circuit through the resistance 26which then adds its heating effect to that of the ordinary or propulsionmotor resistance 25 already in circuit.

It will thus be seen that I have provided a simple, eilicient andcompact apparatus for heating and ventilating an enclosure such as theinterior of a trolley car. The heating resistances and the main powercircuits including those containing the motor and .relay etc. can not beclosed for eflective operation until and unless the fan blower is inoperation at above a predetermined speed since the circuits of thesedevices are closed through contacts controlled by the governor which isunder the dominance of the shaft of the fan blower. Also the fullheating effect is not achieved unless the thermostat in the enclosure isin operative condition due to low heat in the interior thereby insuringthat overheating oi the interior is not possible.

Of course the motor I! may be used with or without the generator 20. I

While the invention has been described in detail with respect to thepresent preferred form thereof shown in the drawing, it is not tobelimited to such details and forms since many changes and modificationsmay be made in the invention without departing from the spirit and 7scope of the invention in its broadest aspects. Hence it is desired tocover any and all forms What is desired to claim and secure by LettersPatent of the United States, is:

1. In combination an enclosure to be heated and ventilated, a fanblower, resistances associated therewith to heat the enclosure, andmeans associated with the fan blower to place the resistances in circuitonly when the blower has reached a predetermined speed of rotation, apropulsion motor, a control device adapted to act as exclusive means torender said propulsion motor eflective, and means by which said controldevice is actuated positively and exclusively by a rotating part of saidblower.

2. In combination with a main energizing electrical circuit and aplurality of power circuits adapted to be energized therefrom, includingat least a propulsion motor circuit and a fan blower energizing circuit,said last-named circuit being normally closed and said propulsion motorcircuit being normally open, an enclosure to be heated and ventilated, afan blower, resistances associated therewith to heat the enclosure,means associated with the fan blower to place' the resistances incircuit only when the blower has reached a predetermined speed ofrotation, a thermostat in the enclosure and means operated bythethermostat to place at least one of said resistances in circuit onlywhen the heat in the enclosure has reached a predetermined degree; andmeans exclusively actuated positively by rotation of a part of said fanblower to render said propulsion motor circuit effective, subject toconventional control.

3. The combination as claimed in claim 1, in which is provided athermostat in the enclosure and means operated by the thermostat toplace at least one of said resistances in circuit only when the heat inthe enclosure has reached a predetermined degree.

4. The combination as. claimed in claim 1, which is provided athermostat in the enclosures and means operated by the thermostat toplace at least one of said resistances in circuit only when the heat inthe enclosure has reached a predetermined level, a relay in circuit withthe thermostat, and switching means operated by the energization of therelay to close the circuit'to said one of said resistances.

ROBERT J. PARSONS.

